Russian hackers tried without success to get into Colorado’s computerized voter system before last year’s election, officials with the Colorado secretary of state’s office said Friday.

The Department of Homeland Security informed Secretary of State Wayne Williams’ office in a phone call before noon that Colorado was among states targeted last summer by hackers earlier identified as Russians — contrary to what DHS officials told Williams earlier this year — but stressed that the hackers didn’t get into the state’s electronic voter data system, Gary Zimmerman, chief of staff for the secretary of state’s office, told Colorado Politics.

“They confirmed we are one of the 21 states where intelligence sources — they didn’t tell us what those were — advised they detected scanning activity here in Colorado,” Zimmerman said. “The analogy would be if somebody went to your home and jiggled the windows and the door handles to see if any were unlocked. That’s what scanning is. At the same time, DHS also confirmed there is absolutely no evidence they penetrated our systems or network.”

The DHS official who informed Zimmerman of the attempted breach only found out Colorado was among the targeted states “an hour or so before we did,” Zimmerman said. “Apparently this information was known in September or October of lat year,” he added, although he couldn’t say whether anyone within DHS had that knowledge.

We’ll update this story as necessary; here’s more from NPR on how and why DHS today informed the 21 states about hacking concerns.